Rex Tillerson got the ax as secretary of state because he was undercutting President Donald Trump on his dealing with North Korea, Kayleigh McEnany, national spokesperson for the Republican National Committee, told Newsmax TV on Wednesday.

"Rex Tillerson, as much as we thank him for his service, there are so many times he undermined the president," McEnany told Newsmax's Dr. Gina Loudon.

"When the president was talking tough on North Korea . . . about fire and fury and raining down on North Korea and doing that for a strategic purpose to get them to stop testing missiles – and it worked I would note – you'd have Tillerson who would come up from behind and . . . water it down, like 'no, military options aren't on the table.'

"And they seemed at odds at times. We cannot have that. We need a secretary of state that stands behind this president, stands behind his agenda, and will go in as an equal negotiating partner with the North Koreans and will amplify the president's message."

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Trump fired Tillerson on Wednesday and plans to replaced him with CIA chief Mike Pompeo.

Last week, Trump said he was prepared to meet with North Korean strongman Kim Jong Un in what would be the first face-to-face encounter between any leaders of the two countries. The powwow could mark a major breakthrough in easing tensions over Kim's nuclear weapons program.